This hasn't happened to me in awhile, but I used to feel it all the time when I was younger: Every now and then when I begin to fall asleep and enter a dream, I feel an intense discomfort all over my body. The best way I can describe it is the feeling you get when a foot falls asleep. Not exactly pins and needles, but severe discomfort. A lucid dream usually follows, but not all the time. I wonder if the pain itself is a dream, but I feel mostly awake. Does anyone else experience this or know what causes it?